基于辅助增压系数补偿的IEHB系统轮缸压力控制研究

Research on Wheel-Cylinder Pressure Control of IEHB System Based on Auxiliary Boost Coefficient Compensation

为解决电动主缸引入导致线控液压制动系统响应迟滞、摩擦非线性及初始压差对压力控制产生不同影响的问题,通过对集成式线控液压制动(IEHB)系统电动主缸进行开环试验分析,提出一种压力控制策略。结合压力分段控制构架,采用基于辅助增压系数补偿的前馈及反馈PID方法对电动主缸进行调控,同时利用逻辑门限值的方法控制增压阀、减压阀及电动泵,实现了基于该IEHB系统的压力控制器设计。执行机构在环试验结果表明,该控制策略响应时间约为150 ms,并能较好地实现压力跟随控制。

In order to solve the problems caused by the introduction of electric master cylinder on the pressure control including delay of response of the hydraulic brake system by wire,the friction nonlinearity and the initial pressure difference,the open loop test analysis of the electric master cylinder of Integrated Electro Hydraulic Braking(IEHB)system is conducted,and a pressure control strategy is proposed.Combined with the pressure segmentation control framework,the feedforward and feedback PID method based on the auxiliary boost coefficient compensation is used to regulate the electric master cylinder,and the logic threshold valueis used to control the pressure increasing valve,the pressure reducing valve and the electric pump,the pressure controller design based on IEHB system is achieved.The results of the actuator in-loop test show that the response time of the control strategy is about 150 ms,and the pressure following control can be achieved well.